Improvement in agricultural caldrons



scribed out. sind anni didn,

EEENEZER E. situ AND yAtouzo H; BENNETT, or ROCHESTER, NEW

l YORK: f

Letters Patent No. 109,679, dated November 29, 1870.

iMPRovEMENT in AGmcuLTuRAL cALpRoNs'.

The Schedule referred to ln these Letters Patent and making part of thesame.

Nature of the Invention.

This invention consists in the construction of the furnace, whereby adouble air-space with a compound circulation is attained; also intheconstruction of the ealdron and steamer proper, as hereinafter delGen-eral .Descrption.

In the drawing- Figure 1 is a central vertical section;

Figure 2, an elevation of the caldron and -stcamcr proper, removed fromthe furnace.

Figure 3, a fragment .of the outside ofthe furnace, showing theVentilating holes. i

represents the furnace, which is simplya vertical'cyliuder, made of castor sheet metal.

It has the ordinary fire-pot B and grate E at the bottom, and is madeopen at the top, toy admit the caldi-on and steamer, whose fiange,.a,rests on top.

The furnace is constructed with two air-spaces, b

- and c, the outer one being located between the outer cylinder and -auintermediate metallic lining, D, and the inner one located between thesaid intcrn'iediate lining and the fire-brick or stares of the fire-potB.

Both these air-spaces are angular', and the outer one of greater extentthan the inner one, caused by carrying the intermediate lining l) uphalf way or more of thc height of the combined caldron and steamer.

Holes l d and f, respectively at the bottom and top of the space l), aremade through the outer walls of the t'uruaccinto space l); and similarholes, d cl'f, are made through the intermediate lining into the innerair-space c, as clearly shown in gs. l and By this means a compoundcirculation of the cold air is insured, viz.:

First, from the outside into thc bottoni, and through the top of theouter space; and

Second, from thc space l to space c into and through This constructionofthe furnace, whereby the double air-spaces wit-h the compoundcirculation are attained forms the first feature of our invention.

By this inea-ns not only the fire-pot, but also the intei-mediate liningand the outer cylinder, are protected against burning out under theintense heat. l

another advantageis that when the fire becomes low, the air-spaces b csurrounding the fire-pot have a tendency to keep it warm, and toYpreserve it, from exposure to the cold outer air, thus insuring a moreuniform and suiiiciently high temperature.

rlhe caldron and steamer proper are constructed in two parts.

First, an outer shell, G, of proper form, to rest inside the furnace;and

Second, the caldron O', which rests in the shell, being made ofsufciently smaller size to leave a jacket-space, 71., which forms thewater and steam-space for the steamer. 4

'lhe caldron may he made of any desired form, but has a raised rim Aorbead, lf, at the top, for the attachment o f' the pipes; and also adepressedjacket or leg m at the bottom, which extends down into thefire-space below the caldron, and aiords an extra capacity for thegcnerationof steam.

The front side of this jacket is made open, as shown at 1), for thepurpose of allowing the feeding in of fuel through the furnace-door. lrj his special construction of the caldron and steamer constitutes thesecond feature of our invention.

rlhe open-topped caldron allows free use without the necessity ot'removing acovering-dme; while the jacket-space, which retains a body ofwater, allows the generation of'steani sufficient for the steaming ofvegetables and food for animals, and for` other' purposes.

rlhe jacket or leg an, extending down into the firespace, not onlyfurnishes an extra large lire-surface, but it also, by reason et' itsconcave form, retains the dame and heat against atoe rapid lescape tothe exitilu'e, and thereby extracts the maximum amount ot' heat rlhisform also serves to hold the gases at that point nearest the tire,whereby. they become burned to a greater degree than if allowcdto risedirect, in which oase a large portion would escape, for the reason thatit would escape at once above4 the temperature suicicnt to burn it.

Ono or more pipes, H, lead from the top of the rim or bead la, toconduct the steam to the steaming reccptaclc.

A stcampipe,1, also'extends to a suitable feedf water apparatus outsidethe oaldron, to equalize the back pressure produced by the steam throughthe feedwater pipe K, which also connects the jacket-space, at thebottom, with the feed-water apparatus.

Furthermore, a safety-valve, L, is used on top, to let off steam underundue pressur i XVe are aware that air-spaces are common in variouskinds of furnaces and stoves; W'e do not claim such broadly.

Clem/ns.l Wha-t we claim, and desire to secure by Letters Pateut isll.The arrangement in the furnace A of the two airfspaces b and c,separated by the intermediate lining D, the outer space heilig ofgreater extent than the-inner one, und the two lmvnga. compound eircu-'lation of air, by means of the passages d fl j' und d' il' j", thewhole operating-inthe manner, and for the' purpose specified. Y

2. The shell C, constructed of such shape as to lit the open-toppedfurnace, and provided with the depending Ieg m, forming ai water-spacebelow the eeldron, and having the opening p in front, in the; manner,and for the purpose specified.

3. The combination of the open-topped caldi-on C andjaeket C', formed asherein described, the said parts being-nrrzmged with the jacket-space hbetween the walls, and with the depending.)r leg m, forming :in extrawater-space below the caldi-on', :is-herein described.

In witness whereof'7 we have hereunto signed 'our names in the presenceof two subscribing witnesses.

EBENEZER,` E. SILL. ALONZO H. BENNETT.

fitnessesz JAS. E, GHENEY, J r., G. WLLLM MIATT.

